You set off from Tower Bridge and finish next to the Cutty Sark in Greenwich, crossing four boroughs on the way: Tower Hamlets, Southwark, Lewisham and Greenwich. Early on you go through Limehouse Tunnel to Canary Wharf, with short hills at the tunnel exit and the Canary Wharf approach. Back in Wapping there is a short cobbled stretch before the climb to Tower Bridge. Rotherhithe is quieter, then crowds build toward Greenwich, where a short bridge climb comes about 500 metres from the line. Water is handed out at the 3, 6, 9 and 11 mile points.
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